SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 25357 papers
This study examines catalytic routes for synthesizing piperazine from monoethanolamine, with attention to catalyst selectivity, reaction conditions, and suitability for a continuous process. A range of dehydration and hydrodehydrogenation catalysts, supports, promoters, temperatures, ammonia ratios,…
This paper extends Yakubovich’s matrix inequality method to discrete difference equations describing automatic systems with a single pulse controller and a scalar nonlinearity satisfying sector and derivative bounds. It formulates a frequency-domain sufficient condition, involving the transfer funct…
This study examines the dynamic absorption of ammonia and chlorine by ion exchange resins, using KU-2 cation exchanger in the hydrogen form and AV-17 anion exchanger in the carbonate form. Experiments measured dynamic activity as a function of resin moisture content, gas concentration and velocity, …
Interferometric observations of Venus at a wavelength of 10.6 cm were carried out in May to July 1964 to investigate the origin of its centimeter radio emission and to test atmospheric and surface temperature models. Measurements of visibility functions with different baselines, polarizations, and o…
This paper examines how elastic compliance in the rotor bearings, suspension, and mechanical transmission of a gyroscopic stabilizer affects its natural oscillation frequencies and stability, correcting the limitations of models that assume perfectly rigid elements. The author derives small-oscillat…
This paper examines whether recrystallization of a solid phase can disturb equilibrium in a heterogeneous system containing a microcomponent distributed between crystals and saturated solution. Starting from the Berthelot-Nernst distribution law, the authors derive a differential expression for micr…
This article examines the nature of adhesive bonding between polymers, responding to claims that strong polymer adhesion can be explained by purely surface chemical or physical interactions. The authors review arguments concerning temperature, contact time, molecular mobility, vulcanization, surface…
This study examines selective electrochemical isolation of the metallide phases Ni3Al and Ni3Nb from a two phase alloy of the Ni3Al, Ni3Nb system. Anodic polarization measurements in several electrolytes were used to select conditions for differentiated dissolution, followed by microchemical determi…
This note studies complete continuity of integral operators acting between ordered function spaces of classes related to \(KB\)-spaces and their duals. It introduces strong complete continuity, defined through compactness with a common order regulator, and relates this notion to \((b,o)\)-linear ope…
This paper studies Cauchy problems for linear differential equations of infinite order with constant coefficients, including homogeneous and nonhomogeneous equations whose characteristic function is an entire function with simple zeros satisfying specified product and growth conditions. It formulate…
The paper studies linear functionals on algebraic polynomials specified by their moments and develops criteria for estimating the number of their true nodes, a quantity related to stability in a parameter interval. Using conditional nodes, resolvents, and weights, it proves a sufficient condition en…
This study extends systematic measurements of the absorption spectra of ferrocene derivatives to the 180 to 600 mµ region, including alkyl esters of ferrocenecarboxylic and 1,1′-ferrocenedicarboxylic acids, and compares them with alkyl and acyl derivatives. Spectra were recorded in isooctane using p…
This study examines how ethylene oxide and amines affect chain transfer in the telomerization of ethylene with carbon tetrachloride initiated by iron compounds in the presence of isopropyl alcohol. The authors compare product distributions under different initiating systems and additives, using gas …
This paper presents an electron-microscopic specimen preparation method for studying the supramolecular structure of polymers directly in solution while avoiding solvent evaporation, concentration changes, and surface-tension effects. The method uses low-critical-temperature solvents such as propane…
The paper addresses the failure of ordinary single-time relaxation theory, and related local relaxation models, to account for acoustic dispersion and absorption in highly viscous liquids. It proposes a phenomenological model treating such liquids as two-phase microinhomogeneous media in which an in…
This note addresses the stability of cylindrical reservoirs with flattened ellipsoidal bottoms under external pressure, a case relevant when internal vacuum can cause the bottom to bulge. Assuming axially symmetric postcritical deformation and approximating the bulge as a mirror-reflected segment, i…
A method is proposed for determining the dynamic stress-strain relation of threadlike materials whose loading diagram contains an inflection point, using transverse impact theory and experimentally measured relations between impact velocity and kink angle. The procedure reduces the reconstruction be…
This paper examines the relation between low-frequency Raman spectra and melting temperatures in normal primary alcohols from C2 to C12, with particular attention to the role of hydrogen bonding. Using literature Raman frequencies and melting points, the authors compare n-alcohols with n-paraffins a…
This paper examines whether the rapid broadening of cloud droplet size spectra can be explained by the combined action of turbulence, gravity, and electrostatic attraction in droplet coagulation. The authors formulate a two-layer model in which turbulent motion brings droplets to a near-contact boun…
The paper reports a gas-phase electron-diffraction study of phenylmonochlorosilane, undertaken to assess how a phenyl substituent affects the single silicon chlorine bond in chlorosilane derivatives. Experimental molecular scattering and radial-distribution curves were analyzed with models for sever…
This paper examines the distributional disorder of lithium-7 atoms in amblygonite, LiAlPO4(OH,F), using quadrupole splitting in nuclear magnetic resonance spectra. Motivated by differing X-ray structural determinations of lithium positions, the authors measured angular dependences of Li-7 satellite …
Low-temperature polarized spectrophotometric measurements were carried out near the long-wavelength edge of intrinsic absorption in high-quality thin single crystals of CdSe and CdS. Using transmission measurements at 4.2 K and 160 K, the study determines absorption maxima, half-widths, oscillator s…
This paper examines a possible instability mechanism in pulsating stars, namely the amplification of fundamental nonradial oscillation modes in a compressible self-gravitating sphere undergoing radial pulsations. Using a simplified homogeneous-density stellar model with a thin surface layer, the ana…
This study examines the position, integral intensity, and splitting of the antisymmetric stretching band of the azido group in the infrared spectra of organic azides. Measurements across azides of several structural classes show that the band occupies a wider range, about 2100 to 2170 cm−1, than com…
This note studies optimal two-dimensional lattices for cubature formulas for smooth functions, where optimality is defined by minimizing the absolutely convergent sum of inverse even powers of distances over lattices of fixed fundamental volume. Building on Sobolev’s connection between such lattices…
The paper studies Besov spaces with possibly nonpositive smoothness from the viewpoint of the Fourier transform, with special emphasis on the zero scale \(B^0_{p,\theta}\). Using lacunary decompositions of the Fourier domain, it gives equivalent norms for anisotropic Besov spaces, extends the defini…
This note studies linear transformations of unbounded complex sequences that diverge to infinity within prescribed half-strips or angles in the complex plane. For regular matrices with finite rows, it gives necessary and sufficient conditions under which such transformations preserve the original re…
The study examines the γ-radiolysis of dilute aqueous Co(III) aquo complexes, including triaquoammine and cis and trans diaquoethylenediamine salts, using measurements of pH, electrical conductivity, absorption spectra, Co(II) formation, and catalytic decomposition of hydrogen peroxide. Irradiation …
This paper examines the mechanism of volcanic tremor generation and its possible use in long-range eruption forecasting. After critiquing earlier models based on oscillating wall blocks or a single lava-column oscillator, it proposes that volcanic conduits and adjacent high-temperature zones act as …
The paper analyzes physical limits on the transverse cross section of radiation beams in optical quantum generators, considering both continuous operation and pulsed operation with Q switching. For continuous generators, the authors model the generation region as two diffraction-coupled subgenerator…
This paper justifies the method of small oscillations for assessing stability and instability of stationary flows of a viscous incompressible fluid governed by the Navier-Stokes equations. The argument formulates the linearized problem as a spectral problem for an operator in solenoidal \(L_p\) spac…
This study examines whether cobalticinium compounds, previously regarded as resistant to hydrogen substitution in contrast to addition reactions with nucleophiles, can undergo isotopic hydrogen exchange in their cyclopentadienyl rings. Cobalticinium hydroxide was reacted with deuteromethanol in the …
The paper proves uniqueness for a two-layer one-phase Stefan-type free boundary problem modeling crystallization of a melt in contact with an immersed refractory plate, with discontinuous thermal coefficients and transmission conditions at the material interface. The argument assumes existence of an…
This paper reports the first preparation and characterization of scandium perrhenates, compounds of interest for the chemistry of scandium. Crystalline scandium perrhenate trihydrate was synthesized by reacting scandium oxide with perrhenic acid, then analyzed by chemical methods, X-ray diffraction,…
The paper examines whether the Kramers-Kronig dispersion relations hold for molecular liquids in the infrared vibrational region, where they are often used to derive oscillator strengths from dispersion data. Using previously measured refractive index and absorption data for an isolated chloroform v…
The paper studies semigroups formed by rectangular binary relations and relates them to matrix partial operatives and matrix 0-bands. It defines an associative construction from a dense binary relation, proves a representation theorem for matrix 0-bands as such constructions with an adjoined zero, a…
This paper examines whether a nonuniform temperature field in a gas can produce anisotropic pressure, contrary to the usual equilibrium form of Pascal’s law. Using the third approximation of the Chapman-Enskog kinetic theory, the authors analyze a gas at rest between two parallel plates held at diff…
This study examines how water content in acetic acid affects hydride shifts and isomerization during solvolysis of deuterium-labeled cyclohexyl p-toluenesulfonates. By analyzing label positions in the products and comparing substrates labeled at different positions, the authors show that 1,2-hydride…
This study examines nucleophilic cleavage of phosphoamide bonds in synthetic adenylyl-(5′→N)-amino acids and adenylyl-(5′→N)-peptides by hydroxylamine. The authors show that hydroxylamine cleaves the phosphorus to nitrogen bond under acidic conditions, pH 4.5, but not at neutral or alkaline pH, libe…
This paper generalizes Sklyarenko’s theorem on embedding a normal space into a bicompact extension of the same weight and dimension. It introduces combinatorial properties defined by the possibility of refining finite open covers to covers whose nerves belong to prescribed families of finite complex…
This paper studies positivity, zeros, and lower estimates for sums of trigonometric series whose coefficients satisfy monotonicity and finite difference conditions. It generalizes earlier results of Fejér and others by replacing pointwise nonnegativity of higher differences with nonnegativity of cer…
This paper reexamines the sequence of product formation in the liquid-phase autoxidation of normal alkanes at moderate temperatures. Drawing on recent experimental data for the decomposition of primary and secondary alkyl hydroperoxides, it argues that the conventional Langenbeck and Pritzkow scheme…
This paper investigates the high pressure phase diagram of sulfur, focusing on the form of its melting curve and possible pressure induced phase transitions. Melting temperatures were measured in a ram type cubic multiplier, calibrated using known bismuth and thallium transitions, and combined with …
This study examines the bulk preparation of graft copolymers of styrene and epsilon-caprolactam using styrene copolymers containing N-methacryloylcaprolactam imide groups as part of the catalytic system for anionic caprolactam polymerization. Copolymers with varying imide-component contents were pre…
